Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/45r20 vs 235/35r20 Tire Comparison Side By Side
  235/45-20 235/35-20 Difference
Diameter inches (mm) 28.33 (719.5) 26.48 (672.5) -1.85 (-47) -6.5%
Width inches (mm) 9.25 (235) 9.25 (235) 0 (0) 0%
Circum. inches (mm) 88.99 (2260.38) 83.18 (2112.72) -5.81 (-147.65) -6.5%
Sidewall Height inches (mm) 4.16 (105.75) 3.24 (82.25) -0.93 (-23.5) -22.2%
Revolutions per mile (km) 711.98 (442.4) 761.74 (473.32) 49.76 (30.92) 7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.69 mph (30.08 km/h)
25 mph (40.23 km/h)23.37 mph (37.61 km/h)
30 mph (48.28 km/h)28.04 mph (45.13 km/h)
35 mph (56.33 km/h)32.71 mph (52.65 km/h)
40 mph (64.37 km/h)37.39 mph (60.17 km/h)
45 mph (72.42 km/h)42.06 mph (67.69 km/h)
50 mph (80.47 km/h)46.73 mph (75.21 km/h)
55 mph (88.51 km/h)51.41 mph (82.73 km/h)
60 mph (96.56 km/h)56.08 mph (90.25 km/h)
65 mph (104.61 km/h)60.75 mph (97.77 km/h)
70 mph (112.65 km/h)65.43 mph (105.3 km/h)
75 mph (120.7 km/h)70.1 mph (112.82 km/h)
80 mph (128.75 km/h)74.77 mph (120.34 km/h)
85 mph (136.79 km/h)79.45 mph (127.86 km/h)
90 mph (144.84 km/h)84.12 mph (135.38 km/h)
95 mph (152.89 km/h)88.79 mph (142.9 km/h)
100 mph (160.93 km/h)93.47 mph (150.42 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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